SSH: implement host key checking.

Change-Id: I5f10bd801bb5cf43e58193c41e62d9ea2f9cb645
Task-number: QTCREATORBUG-13339
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

src/plugins/remotelinux/genericlinuxdeviceconfigurationwidget.h

@@ -62,6 +62,7 @@ private slots:
     void handleFreePortsChanged();
     void setPrivateKey(const QString &path);
     void createNewKey();
+    void hostKeyCheckingChanged(bool doCheck);
 
 private:
     void updateDeviceFromUi();